Awesome Cyber Monday

Sacrifice a creature: Regenerate target creature.

If an opponent controls an Island and you control a Mountain, you may cast this spell without paying its mana cost. Destroy target artifact.

Sacrifice a creature. Rupture deals damage equal to that creature's power to each creature without flying and each player.

Flying (This creature can't be blocked except by creatures with flying or reach.) Other black creatures get +1/+1. Nonblack creatures get -1/-1.

Sacrifice Seal of Removal: Return target creature to its owner's hand.

Lands don't untap during their controllers' untap steps. At the beginning of each player's upkeep, that player untaps a land they control.

You may return an Island you control to its owner's hand rather than pay this spell's mana cost. Counter target spell unless its controller pays {1}.

Sacrifice Seal of Cleansing: Destroy target artifact or enchantment.

{T}: Add {C}. {2}, {T}: You may put a basic land card from your hand onto the battlefield tapped.

Sacrifice Seal of Fire: It deals 2 damage to any target.

You may sacrifice two Mountains rather than pay this spell's mana cost. Create two 1/1 red Goblin creature tokens.

Flame Rift deals 4 damage to each player.

You may sacrifice a Mountain rather than pay this spell's mana cost. Target creature gets +X/+0 until end of turn, where X is the number of Mountai...

Sacrifice Seal of Doom: Destroy target nonblack creature. It can't be regenerated.

{1}{B}{B}, {T}: Destroy target tapped nonblack creature. {3}, {T}: Search your library for a Mercenary permanent card with converted mana cost 3 or...

{U}{U}, {T}, Discard a card: Counter target noncreature spell.

{U}{U}, {T}, Discard a card: Counter target creature spell.

Gain control of target creature with converted mana cost X or less.

Whenever a player casts a creature spell, that player sacrifices a permanent unless they pay {1}.

{T}: Add {C}. {1}{W}, {T}: Prevent all combat damage that would be dealt by target attacking creature this turn.

Fading 4 (This artifact enters the battlefield with four fade counters on it. At the beginning of your upkeep, remove a fade counter from it. If yo...

At the beginning of each opponent's upkeep, Rackling deals X damage to that player, where X is 3 minus the number of cards in their hand.

{2}, {T}: Tap all other artifacts. They don't untap during their controllers' untap steps for as long as Kill Switch remains tapped.

Search your library for up to two Forest cards, put them onto the battlefield, then shuffle your library.